Learning notes: a qt applet that runs successfully on the Development Board

I have been buying a Development Board for three months and can finally make some small things.

But I forgot later, so I decided to start taking notes. I hope to communicate with csdn

My Development Board runs the kernel of linux2.6.24, qtopia for GUI, so QT for development tools.

At first, I could not understand the book I borrowed from QT. Later I followed the example in the document and found that QT is actually not difficult and powerful.

This is a small program written with QT today. Its function is very simple. It is a simple clock, reads the system time, and updates it once a second.

Clock. h // clock class declaration and header file inclusion

Code:

1. # Include <qapplication. h>
2. # Include <qsound. h>
3. # Include <qlabel. h>
4. # Include <qdatetime. h>
5. # Include <qstring. h>
6. # Include <qnamespace. h>
7. # Include <qfont. h>
8. # Include <qtimer. h>
10. Class clock: Public qwidget
11. {
12. Q_object
13. Public:
14. Clock (qwidget * parent = 0, const char * name = 0 );
15. Public slots:
16. Void repainttime ();
17. PRIVATE:
18. Qtime nowtime;
19. Qstring time;
20. Qlabel * label;
21. };

Clock. cpp // clock implementation

Code:

1. # Include "clock. H"
3. Clock: Clock (qwidget * parent, const char * Name): qwidget (parent, name)
4. {
5. Label = new qlabel ("", this );
7. Qtimer * timer = new qtimer (this );
8. Connect (timer, signal (timeout (), this, slot (repainttime ()));
10. Label-& gt; resize (100,100 );
11. Label-> setfont (qfont ("Times", 18, qfont: bold ));
13. Nowtime = qtime: currenttime ();
14. Time = nowtime. tostring ();
16. Label-> settext (time );
18. Timer-> Start (1000, false );
19. }
21. Void clock: repainttime ()
22. {
23. Nowtime = qtime: currenttime ();
24. Time = nowtime. tostring ();
25. Label-> settext (time );
26. }

Main. cpp Main Function

Code:

1. # Include "clock. H"
3. Int main (INT argc, char ** argv)
4. {
5. Qapplication app (argc, argv );
6. Clock;
7. App. setmainwidget (& clock );
8. Clock. Show ();
9. Return app.exe C ();
10. }

Next, I plan to use the buzzer to make a simulated alarm.

Write a little bit every day, the program will get bigger and bigger